Sacral neuromodulation (SNM) is a clinically effective intervention for treatment of urinary and bowel disorders. The aim is to establish the hypothesis that there is a common mechanism of action for SNM in both systems. Current knowledge includes the following: (1) Therapeutic parameters may be different for the 2 efficacy measures. (2) SNM invokes neural circuits that can be observed as neurochemical changes in specific neuroanatomic structures downstream from the therapy delivery site. (3) There are important central nervous system effects for both therapies. (4) Clinical observations regarding normal continence sensations as well as physiological measures of continence are different for the 2 therapy areas.
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